/*
* vb2_check_recovery_request looks up different components to identify if there
* is a recovery request and returns appropriate reason code:
* 1. Checks if recovery mode is initiated by EC. If yes, returns
* VB2_RECOVERY_RO_MANUAL.
* 2. Checks if recovery request is present in VBNV and returns the code read
* from it.
* 3. Checks recovery request in handoff for stages post-cbmem.
* 4. For non-CBMEM stages, check if vboot verification is done and look-up
* selected region to identify if vboot_refence library has requested recovery
* path. If yes, return the reason code from shared data.
* 5. If nothing applies, return 0 indicating no recovery request.
*/
int vboot_check_recovery_request(void)
{
int reason = 0;
/* EC-initiated recovery. */
if (get_recovery_mode_switch())
return VB2_RECOVERY_RO_MANUAL;
/* Recovery request in VBNV. */
if ((reason = get_recovery_mode_from_vbnv()) != 0)
return reason;
/*
* Check recovery flag in vboot_handoff for stages post CBMEM coming
* online. Since for some stages there is no way to know if cbmem has
* already come online, try looking up handoff anyways. If it fails,
* flow will fallback to looking up shared data.
*/
if (cbmem_possibly_online() &&
((reason = vboot_handoff_get_recovery_reason()) != 0))
return reason;
/*
* For stages where CBMEM might not be online, identify if vboot
* verification is already complete and no slot was selected
* i.e. recovery path was requested.
*/
if (vboot_possibly_executed() && vb2_logic_executed() &&
!vb2_is_slot_selected())
return vb2_get_recovery_reason_shared_data();
return 0;
}
static int vboot_locate(struct cbfs_props *props)
{
struct region selected_region;
/* Don't honor vboot results until the vboot logic has run. */
if (!vb2_logic_executed())
return -1;
if (vb2_get_selected_region(&selected_region))
return -1;
props->offset = region_offset(&selected_region);
props->size = region_sz(&selected_region);
return 0;
}
